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Note 11 - Stockholders' Equity and Stock Incentive Plans - Dividends (Details) | 12 Months Ended
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Dec. 31, 2020 $ / shares
Dividend Declared December 7, 2017 [Member] |
Dividends, record date | Dec. 28, 2017
Dividends, payment date | Jan. 15, 2018
Dividends, amount per share (in dollars per share) | $ 0.05
Dividend Declared March 2, 2018 [Member] |
Dividends, record date | Mar. 16, 2018
Dividends, payment date | Apr. 15, 2018
Dividends, amount per share (in dollars per share) | $ 0.05
Dividend Declared June 8, 2018 [Member] |
Dividends, record date | Jun. 29, 2018
Dividends, payment date | Jul. 15, 2018
Dividends, amount per share (in dollars per share) | $ 0.06
Dividend Declared Sept 14, 2018 [Member] |
Dividends, record date | Sep. 28, 2018
Dividends, payment date | Oct. 15, 2018
Dividends, amount per share (in dollars per share) | $ 0.06
Dividend Declared Dec 7, 2018 [Member] |
Dividends, record date | Dec. 28, 2018
Dividends, payment date | Jan. 15, 2019
Dividends, amount per share (in dollars per share) | $ 0.06
Dividend Declared Mar 4, 2019 [Member] |
Dividends, record date | Mar. 15, 2019
Dividends, payment date | Apr. 15, 2019
Dividends, amount per share (in dollars per share) | $ 0.06
Dividend Declared June 7, 2019 [Member] |
Dividends, record date | Jun. 17, 2019
Dividends, payment date | Jul. 15, 2019
Dividends, amount per share (in dollars per share) | $ 0.07
Dividend Declared September 17, 2019 [Member] |
Dividends, record date | Sep. 27, 2019
Dividends, payment date | Oct. 15, 2019
Dividends, amount per share (in dollars per share) | $ 0.07
Dividend Declared Dec 17, 2019 [Member] |
Dividends, record date | Dec. 27, 2019
Dividends, payment date | Jan. 15, 2020
Dividends, amount per share (in dollars per share) | $ 0.07

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- Definition Date the declared dividend will be paid, in CCYY-MM-DD format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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- Definition The per share amount of a dividend declared, but not paid, as of the financial reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 + Details
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